Question

In nuclear fusion light nuclei must have what mass no limit

Answer 1

Heavier nuclei can also undergo fusion, but that's not very useful for energy production. One of the reasons is, as you've mentioned, the binding energy per nucleon. Let's have a look at the binding energy curve

E.g. ➡️ Iron-56 has the highest binding energy per nucleon, which means it is the most stable nucleus. Roughly speaking, elements left of iron-56 in this graph can release energy by fusion. You could also fuse elements heavier than iron-56, but this will only cost you energy.

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Answer 2

In nuclear reaction the ☆Light nuclei☆ does not usually undergoes nuclear fission. After that it requires a additional amount of energy to add nucleons to the nucleus, So nuclei heavier then iron generally releases energy during

☆Nuclear Fission ☆

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